From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDF6BC11F66 for ; Wed, 14 Jul 2021 01:31:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C017461374 for ; Wed, 14 Jul 2021 01:31:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237343AbhGNBeQ (ORCPT ); Tue, 13 Jul 2021 21:34:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:38680 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237286AbhGNBeP (ORCPT ); Tue, 13 Jul 2021 21:34:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C4EB56128B; Wed, 14 Jul 2021 01:31:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1626226284; bh=GhhAgrzg6+D3QZxWK/qCyoqLLb801ORLrL4xD0yZs7c=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=1jfYwAwWnlof215iZQWp18105XkOaH44dMKb/2tpkwfIWo/PnFEQpMjYpij0Rcy1K /jmfPGqEx8TD+03EXZXQU1gSvpqoI0/HYNuI7z8OVFuK9H0ExwEDHXjd11ccXidEm0 DrCK/UbiAz4LXhaAhbAFnzRf5N4JK4FKSj9aS4Po= Date: Tue, 13 Jul 2021 18:31:23 -0700 From: Andrew Morton To: Christoph Hellwig Cc: Ira Weiny , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 1/2] mm: call flush_dcache_page in memcpy_to_page and memzero_page Message-Id: <20210713183123.699769a1b0ee95d69606c35d@linux-foundation.org> In-Reply-To: <20210713055231.137602-2-hch@lst.de> References: <20210713055231.137602-1-hch@lst.de> <20210713055231.137602-2-hch@lst.de> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 13 Jul 2021 07:52:30 +0200 Christoph Hellwig wrote: > memcpy_to_page and memzero_page can write to arbitrary pages, which could > be in the page cache or in high memory, so call flush_kernel_dcache_pages > to flush the dcache. I assume this presently is not known to cause any problems, but that some problems might be discovered in the future? In which case, should we cc:stable?